Hello everyone,

I'm afraid that what I want to do is impossible, but here goes anyway.

I have a Ext.Window with a tbar that contains (among others) a FileUploadField that is rendered just like a button (I followed the demo on the FileUploadField).
The thing is, I don't have any forms in this tbar and when I select a file I call a function where I want to create a new temporary form, add the value coresponding to my selected file, and submit the temporary form.

I tried copying the value for the filename in a new file upload field, but I get an exception (something like "security exception" - sorry - I don't have the actual error now). My guess is I can't write from javascript to a file upload field (most likely to prevent hidden file uploads from the client). Is this right?

If yes, then, can anyone give me a hint on how I can add the upload button to my tbar inside a form of some sort, so that I can just submit that form instead of creating a duplicate? I tried to add a FormPanel, but it doesn't render well at all (has border, wrong color background), and also I added a BasicPanel, but it can't render the window.

Here's my code so far:

//initialize the editor grid
this.listingEditorGrid= new Ext.grid.EditorGridPanel({
   tbar: [{
      xtype: 'fileuploadfield',
      id: this.prefixID+'formFile',
      buttonText: "Upload CSV",
      buttonOnly: true,
      listeners: {
             'fileselected': this.fileUploadButton.createDelegate(this)
   } ...]
/* upload the file and do the parsing */
    fileUploadButton: function(upload, filename){

        //create a temporary form and copy the file name + submit it.        
        var hiddenform = new Ext.form.FormPanel({
                                task: "UPLOAD",
                                authKey: login.authKey
                            renderTo: "x-desktop",
                            method: "POST",
                             fileUpload: true,
                             hidden: true,
                             url: this.dataStoreURL,
                             waitTitle: "Uploading and parsing CSV - please wait...",
                             items: [{
                                 xtype: 'textfield',
                                 inputType: 'file',
                                 name: 'csv',
                                 value: filename
         //submit the form
             success: function (form, action){
                 Ext.Msg.alert('Success', action.result.msg);
             failure: function (form, action) {
                 Ext.Msg.alert('Failed', action.result.msg);